Abstract
We experimentally demonstrated a passively mode-locked picosecond Tm,Ho:LiLuF4 laser with low threshold and high efficiency. The stable continuous-wave (CW) mode-locked operation with 12ps pulse width is obtained by using a five-mirror cavity structure and semiconductor saturable absorber mirrors (SESAMs). The results indicate that the laser offers a mode-locked threshold power of 1.03W and maximum mode-locked output power of 350mW. The repetition rate of mode-locked pulse sequence is 98.04MHz, corresponding a maximum single pulse energy is 3.51nJ.
Highlights
In recent years, 2 μm ultrashort-pulsed lasers based on doped Tm3+ or co-doped Tm3+ & Ho3+ are one of the frontier research contents of ultrafast laser technology
The results show that the crystal achieves the current highest efficiency of 53.6% under CW operation; the maximum mode-locked output power is 350 mW at 1,895 nm, and the typical pulse width is 12 ps
It is concluded that the laser cavity (100, 75) has the best comprehensive output performance under a 1.5% output coupling (OC) mirror
Summary
2 μm ultrashort-pulsed lasers based on doped Tm3+ or co-doped Tm3+ & Ho3+ are one of the frontier research contents of ultrafast laser technology. The emission peak of a Tm3+ doped laser is located near the strong absorption peak of water, at 1.93 μm, so it has the characteristics of a low penetration depth and has important applications in ophthalmic laser surgery, tumorectomy [1, 2]. The laser has excellent atmospheric permeability and will play an important role in military and space communication fields. The laser spectrum is located in the “fingerprint” region of the reaction molecule’s absorption characteristics, so it has important application value in the field of accurate time-resolved molecular spectroscopy [3]. It has an important application in 3–5 μm mid-infrared band generation, mid-infrared supercontinuum generation and THz band pulse generation [4]. Realizing a mode-locked operation is one of the technical difficulties it faces due to Q-switching, caused by water molecular absorption and gain medium spectral modulation
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